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    1985 Mariner 40hp

    One idea leads to another. Any idea as to the engine serial number?
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    Adjusting idle on EFI 4 stroke

    What is the engine serial number?
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    2005 Yamaha 150HP water pump drive shaft leaking.

    Here is water flow from the water pump in action.
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    2005 Yamaha 150HP water pump drive shaft leaking.

    He must have been able to remove the lower unit in a nanosecond so as to see water flow from the water pump.
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    2005 Yamaha 150HP water pump drive shaft leaking.

    How were you able to see the water pump with the lower unit installed?
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    Yamaha F 90 temp gauge hook up

    The three wire connector is so that pressure data can be fed to a Yamaha digital gauge. When an optional sensor is installed. You are not going to be using the connector. I only pointed it out because the sensor to which the connector is connected is plumbed to a port on the block. The same...
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    Yamaha F 90 temp gauge hook up

    Clearly you have a different block. Your model has provisions for an optional speed sensor and optional pressure sensor. The pressure sensor wiring connector has three wires going to it. Blue/black, black and orange. See if you can find that connector. Should have the letter W on the wiring...
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    Yamaha F 90 temp gauge hook up

    The motor makers have dealers that are set for and intended to provide customer support. Thus Yamaha the USA distributor suggesting that a Yamaha USA dealer be contacted. Here is the hook up point for an earlier model Yamaha F90. See if your motor has a similar connection point somewhere on it...
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    Yamaha F 90 temp gauge hook up

    Unfortunately, Yamaha has to be this way. A customer misunderstands what he is being told to do, does something that is screwed up, which might cause damage, and he wants to blame Yamaha. Do you know the model of your 2022 F90? It might just matter.
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    Yamaha 704 binnacle remote question

    My guess would be that the majority of users don't want to have to engage a button before the motor can be shifted into gear. In a panic situation (say the boat is about to be run over) where the boat needs to be shifted and throttled up quickly, I can see someone forgetting to press the...
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    Yamaha 704 binnacle remote question

    But just bumping a conventional 704 control box into gear is not going to make the boat take off. It will slowly start moving.
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    Yamaha 704 binnacle remote question

    The 704 can be had with the lock button for those that need it.
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    130 v4 tach question

    Where was the wrong green wire? There is only one green tachometer wire in the ten pin harness.
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    Correct Sparkplug 2000 200hp Saltwaterseries 2 stroke

    What is the document number for your service manual? This is what I have seen.
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    Correct Sparkplug 2000 200hp Saltwaterseries 2 stroke

    Information comes from the Yamaha service manual and owner's manual.
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    yamaha F250 DERATE to F225

    Yes. It is possible. Would be helpful to know which 3.3 liter F250. They are not all the same.
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    1988 Mercury 9.9hp two stroke electrical…

    Kill switch wires when connected will cause a motor to not run. The wires are disconnected so that it can run.
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    1988 Mercury 9.9hp two stroke electrical…

    Are you saying that the motor will not turn over with the remote controls and now it won't turn over with the rope starter? Turn over to me means a motor being cranked (rotated) so as to start. As opposed to a motor that will crank but not start. Or which might crank and start but not run. Are...
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